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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5d0d29f6babf32e9601b82f835192c34c0929612f4f8a160321b6f5518aaf7' 
  AND token = 'bOR3dnUL8gLBUS7vLDGapM93Tc1n9K43kD2Rh7QoNjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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