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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9f3a99704411f3828d52587d1f8d67862faafb4f1602e6cd62049417afbe7e' 
  AND token = 'UvCsEzydosO5rBZWoj3thlQU/SoVgiTk7QHanT6luy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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