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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42114538578aedda103aaa6b8de2fc1a9a9a1a355a246d3c98937f4e7d0104c' 
  AND token = 'm8dXxexkPZMGhQJkS20sH/uvLZzpyxCExfR2qeQTju0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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