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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8794bac26a877cd4c77f4906d798bcd15701fb57d843b0640a1bb3bf8eefd6' 
  AND token = '6JNKBO2oFWISyVezUZKzMM1ahAU+CdzUc94aMr0ae4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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