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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccc54fb036531199b1c190cad645844e3113c760bcf432e19af1ad1a702cb1a' 
  AND token = 'IK+EbOvo/oS0u8KJKIW9GfQPwTeyHrdzvsu+jBNnWPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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