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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ab5a7c94046d9449f62e4016d6d36dd8ceabb01599d7216db8a3b7d8c0656e' 
  AND token = 'maYeV4XT2AmNW8bbrgK1tQaO7ig69O4VeH7kuemsvCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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