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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c058eca8217fd87df6a00138495606c5fb0b4d35aeb576fb15a19bd54395c60' 
  AND token = 'z1cVAOU1w/hmcDmUHQ/WJvpCCG8Gv4ehoGCf2kx2XD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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