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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf235ccd1586393bb72505dde2b50938e467c13847aa8750de1d3a64b7743c6' 
  AND token = 'qKdTMIzjGvccRgdHNLF8wJvTlR5koN8NTSyFIBkuk+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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