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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f69cd381567ba42c36dfa48375652c094006b2b0ce76d01d4fd4662fdc4f0c' 
  AND token = 'wDUJvovZNs3tMP9sRbBAL0W80WJvfJJweQDechx/NSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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