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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68ee89ffc4064761c579866f246515f6d4d6e5c2b30434f9d5ac061b48068c6' 
  AND token = 'V5d+FzXcbWETMC0stk/no/NOEoIRWKB8BlIcayZzDCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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