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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf60de7559fc1d9024525497d0c037f6c3979d7e8c9ec16593cdd9a20892b8b' 
  AND token = 'BV1s2iiIB61emSOJh4RbAhvdp7Fhewoc+2q+iKH65Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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