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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c4393052981338b77fd8a9317fb6822cfbff38b94d13270614784e63c12caf' 
  AND token = 'kwHa47+dNi/o4AoIsAMYXA37441L01SpiuSbTPw2VYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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