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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95b4268835dbb5e713593daa32913dea8ccf5ccf6cba229ce7d3cca76d28cd6' 
  AND token = 'xKxJ6YpvcQxp6q6lI/Qc9jB5BpczMYhEvx9LTebeKkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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