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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a6ae6cf55ff2c7b478dd7f732c502ab982c51845c0c12756b2bab09da8584b' 
  AND token = '3npiiaL1H/CnENzauVqDga3/geeZrqeiT2W6HdzZGlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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