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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f51a07000a933d934daea25bdede09b29636848aa588e68bd3bc3b04b87bdd' 
  AND token = 'uRI7/qmATuswkADdFpntqaRcXDjlRBM7LJbiXVA//t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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