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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e34131fbb024ed4bc19a2e0524ef05d61e6787b0b4086f2d249d4aaac694846' 
  AND token = 'a2tfrXAOJRhjYFL9pIa/Wgq2/sjiSoLwDh9EkxPwThg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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