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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23098706cb2f5d7688f56b095180aa7778ef473d7c95e33ce516ba979ef96a50' 
  AND token = 'zoVJHrbG0tFQNTaUlZ3Ao/o+av50gHMaIdU4b/v5BCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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