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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc262c62e456724a2d5b48ce17ce2bde48611f021ecd64d65b4a2eda340b74f5' 
  AND token = 's/AImo6crus3aVPjhZAd0w+1XI5J7RAbEBT9HVuhR1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}