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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e0152c4d17752ee53be6d25bd40554448bfd23854e77d7d18f715c2d8d2e4a' 
  AND token = '61Ms/bWXXF68gXWMX7Nej+jZNWVafrraCOKzJoXudVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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