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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc9a162b4cada08e2fef27d1cce8d3d3723183ffda96e52039691a1677dea23' 
  AND token = 'v+wrhthYNW4nH1EE1H8APLx239fobQa+sANJvNoOtNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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