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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba262e6c0cd28af18a9ec6f27f6d4443222187f41f31e025e32fd47c78df96c' 
  AND token = 'ZpvkoURG5fjVF3+Sf0QAr+n2SWNX/HyqH9/k8LLg3Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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