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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ee2d8948556ed85718ca6b08c24eff849489af12de3fb40861af97ce80368a' 
  AND token = 'm0ineI/xcpwZa/N4BobDTQMRoDLT58oLSPQXaBca76E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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