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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3eb5602c70cc25e460d09771e0344b58be81d14015a138896701d0bc9f6641' 
  AND token = 'Pa430MkpeMp/w4zJZGt4PefYR1CYvv71mQNmH1rECNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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