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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80bba6c1ed6ae8e695983433ba47cbaf02c647e40ecbc31ac49ffcade3e550d0' 
  AND token = 'bzdLuGgrLGSMU1J92Kuh+8Ah4VQC/s0Q5bd9k2uu/fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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