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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d93d563935e4d6ffa32a418b0f0264982bbcb71093312e26da2559b907e7c6b' 
  AND token = 'neOArqf05uRiK0dPA4kAc2/WWSWEKLAYkHxSRNha/R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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