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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26bd73448a44407962bb70b12789d4393228bd8c01710acba50ba8aac60e772' 
  AND token = 'iaeNxh/5rSJUnS6/gqxM7PdcQ3VMBi0fXSnCuR90irM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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