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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e8dac4fd7eaab9f761e2fc250df92a64aed601af2295b590b4dbb0670d5896' 
  AND token = 'Uvrp/f4vagA+qkYOZPyZeVsOFXbvIVn2vN33ITV6NCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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