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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6420c0082655881867d62c16f07e516b4c945161071d2b8ca603ca477d0f99' 
  AND token = '9oG43/oEfSEpNPfStdkU+tVnHY6yOoYS0HTpPq2XgnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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