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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52263ee41db3f298d64a1a67f54c363b44056247c67524ae4d63e62bb55a71d6' 
  AND token = '8aJRpfmxVHc64JuiFTSu/MMf91oZ0QmvtI6oQ3joWjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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