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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b881059da0f2741c155260f9706049c8ea42a2295ec2ee9ceb9194d9d651ea8' 
  AND token = 'jruwBzU485Uv2xdp2ehddicQAlQuYKiaLFNUONur4fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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