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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2aa875c1222a7330f4478382455155ea4b9bb8fb15bbcbd25574f04626170c' 
  AND token = 'jaxS0NvbJ3EV2cly1POa5EF3mniNxEAWci2jDD2aIXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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