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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7465e30d3e13e02985d103bef223c66e216531bb211c349b2cb21b03ef5c89' 
  AND token = 't8GIPrxxaQLbJu7QeKLGYVnmFs6erZGF76/7LLHD748=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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