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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268d015b9e7f89ffdc7e64c72c973ba6b6ad4eb663c588623500043384942950' 
  AND token = 'fmDbg250e0+juor0aeoOi44bQD0Xe3Q2t4Y7xghPYJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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