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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c42836e32af75ade9d15cd7172929b9b000638f4fe0ef5b3c13de9ef7c2437' 
  AND token = '48P6M3ecodsAF/UWRwpcwC57IoiyeANvs+Kglg/7nEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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