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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e7054807640d3a1d2c5e4e347b33d32f3d4bd760dfffe3c39e50b294cbd74c' 
  AND token = '/nhCDTAVnb/E6auWSm8t/upnDeEjxQhwAodZE8dyxoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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