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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d1dc37bcbc18022d730e4e39d450519c5bfa897e8c0e61a7ec3e5c7f2e02e9' 
  AND token = 'xo6OvhW3ShD+C2b2Lj2qwol/LMcob1Jq8HX1AEO2y18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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