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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d36d76895beb1112f7c3bced1d829bc8b8772c988585617be9d1e84521e5737' 
  AND token = 'V4z3yzj5v3o/egHrcb1uqTUi6S2+V2KT9dctzAcCGFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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