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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f5eed23400861e2244e7ac8ef7ae8e35c05bddf862422086d97684d11a2b84' 
  AND token = 'qB6v61aqrjsJmp4w9FAJ8NSCGUSbGkMCAimt90w6Sc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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