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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8a66e3156876b37830777ece051da76eb3e0a5a0b821553cf96a296fd8893b' 
  AND token = 'ci+vkG/cvSNOAvMKt++yoyvm7nfBdLZw9nCbYbFWMc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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