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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbbef64e3011979e204ebfe738c9b2abe53243c4bc97e7c6a8bcd5b91cf813c' 
  AND token = 'eN/6y6n0Gpuwf7G5Gq56VUHZCczsLBtvE1qt7teLziA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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