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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcb88716b438dc284a239aab63c8ce47e645d28be097f3120f647f70fe1f68f' 
  AND token = '/7XUY/WeDVPNj9K03KoTdXk6MLEqBA4XAmUr2bu7mB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00193

JSON explain

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