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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bf85e2c4293b35cd4775eb41754e53fbd08aebad28877e726259938d66ad74' 
  AND token = '6SaESS+g7ltUYy+WI+KLkfveDD/1+LvFyoLAFpVR7Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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