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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa61fac01dd661c3f9e3c0a38e2b113a0cabdb2743584cb9b86707ecc7b87bd9' 
  AND token = 'ajGrzZpEnqPGU0d7vMZ1DUSydCmWc81sTtUcqO++TbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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