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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f920e5581b7fc88e0d2f2242edb8cd4de893854cf2499d0397b22a7f40505cf9' 
  AND token = 'HR69Sp95Z+Gus6bO79F4UKuQNm6CXOn80EAP9WkOPSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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