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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64397eb2a6f2cbf8c7d2a0102faef91cc71d4c581ea98662afa928496294ba3' 
  AND token = 'EBwkI5WyJiXZ2Tmkw/uxC1yMhN39ONakX24sL7kSycE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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