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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5316c97e93b3071681c986d0d9ed606e9641bc61d1ab729f63f51b9e2e6f9e6b' 
  AND token = 'qavX1icSGP3YAlm5Km8F/t2fsXPi9fdJv8wB+JjFIIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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